| http://www.w3.org/ns/prov#value | - The optical pickup as set forth in claim 14, wherein the diffraction optical element satisfies ??=??D+??L=0 where ?? is a power of the diffraction optical element, ??D is a power of the diffracting face of the diffraction optical element, and ??L is a power of the refracting face of the diffraction optical element. 16.
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